:root{
    --bg:#0b0f14;
    --panel:#121826;
    --text:#e6ebf5;
    --muted:#9aa4bf;
    --line:rgba(255,255,255,.10);
    --accent:#6ee7b7;
    --accent2:#34d399;
    --max:1060px;
    --radius:16px;
    --shadow: 0 18px 50px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
    background:
            radial-gradient(900px 450px at 10% -10%, rgba(110,231,183,.14), transparent 60%),
            radial-gradient(700px 400px at 90% 10%, rgba(52,211,153,.10), transparent 55%),
            var(--bg);
    color:var(--text);
    line-height:1.6;
}
a{color:inherit;text-decoration:none}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

/* Header */
header{
    position:sticky; top:0; z-index:20;
    border-bottom:1px solid var(--line);
    background:rgba(11,15,20,.72);
    backdrop-filter: blur(10px);
}
.nav{
    display:flex;align-items:center;justify-content:space-between;
    padding:16px 0;
    gap:14px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:750;letter-spacing:.3px}
.mark{
    width:30px;height:30px;border-radius:10px;
    background:linear-gradient(135deg, var(--accent), var(--accent2));
    box-shadow:0 14px 40px rgba(110,231,183,.18);
}
nav ul{list-style:none;display:flex;gap:18px;margin:0;padding:0;align-items:center}
nav a{color:var(--muted);font-weight:650}
nav a:hover{color:var(--text)}
.btn{
    display:inline-flex;align-items:center;justify-content:center;
    padding:11px 16px;border-radius:999px;
    border:1px solid var(--line);
    background:rgba(255,255,255,.04);
    font-weight:700;
    transition:.2s ease;
    white-space:nowrap;
}
.btn:hover{background:rgba(255,255,255,.08);transform:translateY(-1px)}
.btn.primary{
    background:linear-gradient(135deg, var(--accent), var(--accent2));
    color:#07120d;
    border:0;
}

/* Layout */
section{padding:64px 0}
section.tight{padding:40px 0}
.panel{
    background:rgba(255,255,255,.03);
    border:1px solid var(--line);
    border-radius:var(--radius);
    padding:22px;
}
.muted{color:var(--muted)}
h1{
    font-size:clamp(28px, 4.2vw, 46px);
    line-height:1.12;
    margin:0 0 18px;
    letter-spacing:-.2px;
}
h2{
    font-size:clamp(22px, 2.8vw, 32px);
    margin:0 0 12px;
    letter-spacing:-.2px;
}
h3{margin:0 0 8px;font-size:1.05rem}
p{margin:0 0 14px}
.divider{border-top:1px solid var(--line);margin:40px 0}

.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:1.2fr .8fr}
.grid-3{grid-template-columns:repeat(3, 1fr)}

/* Hero */
.hero{
    padding-top:64px;
}
.hero-wrap{
    display:grid;
    grid-template-columns:1.05fr .95fr;
    gap:22px;
    align-items:stretch;
}
.pill{
    display:inline-flex;align-items:center;gap:8px;
    padding:7px 11px;border-radius:999px;
    border:1px solid var(--line);
    background:rgba(255,255,255,.04);
    color:var(--muted);
    font-weight:650;
    font-size:.92rem;
}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}

.hero-media{
    border-radius:22px;
    overflow:hidden;
    border:1px solid var(--line);
    background:rgba(255,255,255,.02);
    box-shadow:var(--shadow);
    position:relative;
    min-height:340px;
}
.hero-media img{
    width:100%;
    height:100%;
    object-fit:cover;
    display:block;
    filter:saturate(.95) contrast(1.05) brightness(.9);
}
.hero-media .overlay{
    position:absolute;inset:0;
    background:linear-gradient(180deg, rgba(11,15,20,.25), rgba(11,15,20,.85));
}
.hero-media .caption{
    position:absolute;left:16px;right:16px;bottom:14px;
    color:rgba(230,235,245,.92);
    font-weight:650;
    font-size:.95rem;
}
.hero-media .caption span{color:var(--muted);font-weight:600}

/* Cards */
.card{
    border-radius:var(--radius);
    border:1px solid var(--line);
    background:rgba(255,255,255,.03);
    padding:18px;
}
.icon{
    width:40px;height:40px;border-radius:14px;
    display:grid;place-items:center;
    border:1px solid rgba(110,231,183,.25);
    background:rgba(110,231,183,.10);
    margin-bottom:10px;
    font-weight:800;
}
ul{padding-left:18px;margin:10px 0}
li{margin-bottom:6px}

/* Inline “diagram” */
.diagram{
    border-radius:20px;
    border:1px solid var(--line);
    background:rgba(255,255,255,.02);
    padding:18px;
    overflow:hidden;
    position:relative;
}
.diagram svg{width:100%;height:auto;display:block}
.diagram-note{margin-top:10px}

/* FAQ */
details{
    border:1px solid var(--line);
    border-radius:14px;
    padding:14px 16px;
    background:rgba(255,255,255,.02);
}
details + details{margin-top:10px}
summary{cursor:pointer;font-weight:700}
details p{margin-top:10px}

footer{
    border-top:1px solid var(--line);
    padding:28px 0;
    color:var(--muted);
    font-size:.92rem;
}

/* Responsive */
@media (max-width: 920px){
    nav ul{display:none}
    .hero-wrap{grid-template-columns:1fr}
    .grid-2{grid-template-columns:1fr}
    .grid-3{grid-template-columns:1fr}
    .hero-media{min-height:260px}
}